What does "toughness" mean?

The state of being tough.; Resistance to fracture when stressed, or the degree of such resistance.

Toughness

Common synonyms include: abstruseness, adamantness, adhesiveness, adjective describing material properties, arduousness, astringency.

noun

noun ·2 syllables ·Common ·High school level

Noun

1
The state of being tough.; Resistance to fracture when stressed, or the degree of such resistance. countable, uncountable
2
impressive difficulty wordnet
3
The state of being tough.; Fortitude; hardiness; mettle. countable, uncountable
4
the elasticity and hardness of a metal object; its ability to absorb considerable energy before cracking wordnet
5
A formidable difficulty. countable, uncountable

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"I still remember staring with fear at his face marked with candor and toughness."

From Middle English toughnesse, towghnesse, towghenesse, equivalent to tough + -ness.